Refrigereated display cabinet with mixed or cross flow fan

ABSTRACT

A refrigerated display cabinet includes a housing surrounding a plurality of shelves, a cabinet tank arranged beneath the plurality of shelves and a backwall channel positioned behind the plurality of shelves. The cabinet tank and the backwall channel cooperate to define an air passage. A micro-channel heat exchanger and a fan are arranged within the air passage. The fan being operable to move a flow of air through the heat exchanger. The fan is one of a cross-flow fan and a mixed-flow fan. The heat exchanger is arranged within the air passage at an angle between about 20 degrees and about 80 degrees or between about 100 degrees and about 160 degrees relative to the flow of air.

CROSS-REFERENCE TO RELATED APPLICATIONS

This application claims the benefit of U.S. Patent Application No. 63/313,524, filed Feb. 24, 2022, the contents of which are incorporated by reference herein in their entirety.

BACKGROUND

Embodiments of the present disclosure relate to refrigerated display cabinets, and more specifically to a flat tube microchannel heat exchanger configuration for refrigerated merchandisers.

In practice, grocery stores and supermarkets use refrigerated merchandisers of different types, which may be open or with doors, for displaying and presenting fresh food and beverages to the customers, while maintaining a desired temperature of the products below a predefined threshold. In order to maintain the low temperature, cold air is circulated to the product display area of the cabinet by passing airflow over a heat exchanger surface of an evaporator. Refrigerant is pumped through the internal passages of the tubes which absorbs the heat from the air via fins and tube surfaces and the refrigerant changes from a liquid phase to a vapor phase in the process. As a result, the temperature of the air passing through the evaporator is lowered. One or more fans are typically included in the base of the refrigerated display cabinet and drive cold air through the heat exchanger, and deliver the cold air to the product display area of the merchandiser. Optimally designed refrigerated merchandisers are configured to maximize the display space without increasing the required footprint of the refrigerated merchandiser.

BRIEF DESCRIPTION

According to an embodiment, a refrigerated display cabinet includes a housing surrounding a plurality of shelves, a cabinet tank arranged beneath the plurality of shelves and a backwall channel positioned behind the plurality of shelves. The cabinet tank and the backwall channel cooperate to define an air passage. A micro-channel heat exchanger and a fan are arranged within the air passage. The fan being operable to move a flow of air through the heat exchanger. The fan is one of a cross-flow fan and a mixed-flow fan. The heat exchanger is arranged within the air passage at an angle between about 20 degrees and about 80 degrees or between about 100 degrees and about 160 degrees relative to the flow of air.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the fan is arranged within the cabinet tank.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the heat exchanger is arranged within the cabinet tank.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the heat exchanger is arranged in a forward mounting configuration.

In addition to one or more of the features described herein, or as an alternative, in further embodiments an angle of the heat exchanger is between about 20 degrees and about 80 degrees.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the heat exchanger is arranged in a backward mounting configuration.

In addition to one or more of the features described herein, or as an alternative, in further embodiments an angle of the heat exchanger is between about 100 degrees and about 160 degrees.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the fan is a mixed-flow fan arranged at an non-perpendicular angle relative to the flow of air through the air passage and the heat exchanger is arranged downstream from the fan.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the heat exchanger axially overlaps an edge of the fan.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the heat exchanger is arranged within the backwall channel.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the fan is at least partially arranged within the backwall channel.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the fan is a mixed-flow fan, the fan being mounted at an angle between −20 degrees and about 20 degrees.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the heat exchanger is arranged downstream from the fan, the heat exchanger being arranged at an angle relative to a flow through the air passage.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the heat exchanger is arranged within the cabinet tank and the fan is arranged within the backwall channel.

In addition to one or more of the features described herein, or as an alternative, in further embodiments a width of a fan inlet is between about 25% and about 75% of the width of the cabinet tank.

In addition to one or more of the features described herein, or as an alternative, in further embodiments a width of the heat exchanger is between about 50% and about 95% of the width of the cabinet tank.

Also disclosed is a refrigerated display cabinet includes a housing surrounding a plurality of shelves, a cabinet tank arranged beneath the plurality of shelves and a backwall channel positioned behind the plurality of shelves. The cabinet tank and the backwall channel cooperate to define an air passage. A micro-channel heat exchanger and a fan are arranged within the air passage. The fan being operable to move a flow of air through the heat exchanger. At least one of the fan and the heat exchanger is positioned within the cabinet tank, and a height of the cabinet tank is less than or equal to about 180 mm.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the fan is a cross-flow fan.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the fan is a mixed-flow fan.

In addition to one or more of the features described herein, or as an alternative, in further embodiments the heat exchanger is arranged at a non-perpendicular angle relative to a flow through the air passage.

BRIEF DESCRIPTION OF THE DRAWINGS

The following descriptions should not be considered limiting in any way. With reference to the accompanying drawings, like elements are numbered alike:

FIG. 1 is a perspective view of an exemplary refrigerated display cabinet according to an embodiment;

FIG. 2 is a side view of an exemplary refrigerated display cabinet according to an embodiment;

FIG. 3A is a side view of a portion of an exemplary modified refrigerated display cabinet according to an embodiment;

FIG. 3B is a side view of a portion of an exemplary modified refrigerated display cabinet according to another embodiment;

FIG. 4A is a side view of a portion of an exemplary modified refrigerated display cabinet according to an embodiment;

FIG. 4B is a side view of a portion of an exemplary modified refrigerated display cabinet according to another embodiment;

FIG. 5A is a side view of a portion of an exemplary modified refrigerated display cabinet according to an embodiment;

FIG. 5B is a side view of a portion of an exemplary modified refrigerated display cabinet according to another embodiment; and

FIG. 5C is a side view of a portion of an exemplary modified refrigerated display cabinet according to yet another embodiment.

DETAILED DESCRIPTION

A detailed description of one or more embodiments of the disclosed apparatus and method are presented herein by way of exemplification and not limitation with reference to the Figures.

With reference now to FIGS. 1 and 2 , an exemplary refrigerated display cabinet 20 is illustrated. As shown, the cabinet 20 includes a cabinet body or housing 22 having a bottom 24, a rear wall 26, a ceiling or roof 28, and side walls 30, 32. A refrigerated space 34 for displaying goods is located between the bottom 24, rear wall 26, ceiling 28, and side walls 30, 32. Arranged at a front side 36 of the cabinet body 22 is at least one door 40. In the illustrated, non-limiting embodiment, the cabinet body 22 includes two doors 40, a left door and a right door, respectively. However, it should be understood that a cabinet body 22 having any number of doors 40 including a single door, three doors, or four or more doors for example, are within the scope of the disclosure. Further, although the doors 40 are illustrated as being at least partially transparent, embodiments where the doors 40 and therefore the contents of the refrigerated space are not visible at an exterior of the refrigerated display cabinet 20 are also contemplated herein.

The at least one door 40 movable between a closed position (FIG. 1 ) in which the door 40 seals or at least partially seals the front side 36 of the cabinet body 22, and an open position, in which the front side 36 of the cabinet body is open and in fluid communication with the surrounding atmosphere. As shown, the doors 40 are configured to pivot or rotate about a respective axis X relative to the cabinet body 22 to transform between the closed position and the open position. The doors 40 can be operated manually, such as via one or more handles 42 for example, or alternatively or additionally, may be operated automatically, such as via a door motor (not shown), for example.

The refrigerated space 34 typically includes a plurality of shelves 44 for supporting the goods displayed therein. As best shown in FIG. 2 , each shelf 44 may be supported at a rear end by a backwall panel 46. A backwall air channel 48 (also referred to herein as a “backwall channel”) formed between the backwall panel 46 and the rear wall 26 of the cabinet body 22 and between the backwall panel 46 and the ceiling 28 of the cabinet body 22 defines a cooled air space. In an embodiment, the backwall 46 includes a plurality of distribution holes or perforations 50 that allow cooled air to pass from the backwall air channel 48 into the refrigerated space 34.

A heat exchanger 52 for cooling the air being provided to the shelves 44 may also be arranged within the backwall channel 48, such as between the backwall panel 46 and the rear wall 26 of the cabinet body 22. As shown in FIG. 2 , a fan 54 is positioned immediately upstream of the heat exchanger 52 at an aft end of a return cavity 56, formed between the bottom most shelf 44 and the bottom 24 of the cabinet body 22. The fan 54 drives air from the return cavity 56 through the heat exchanger 52, thereby causing all of the air to be cooled while flowing into the backwall channel 48. Accordingly, in combination, the return cavity 56 and the backwall channel 48 may be considered to form an air passage through the cabinet body. While a portion of the cold air flows through the backwall holes 50, another portion of the cold air continues to flow upward to the portion of the air channel 48 arranged adjacent to the ceiling 28. A redirection feature or a Discharge Air Grille (DAG) 58 may be arranged at the ceiling 28. When the air flow contacts the redirection feature or the DAG 58, the flow direction of the air is changed, such as by about 90 degrees, for example, such that the redirected cooled air is directed towards the lower shelves 44. It should be understood that the refrigerated display cabinet 20 illustrated and described herein is intended as an example only, and that any refrigerated display cabinet 20 having one or more doors 40 movable to access an internal refrigerated space 34 is within the scope of the disclosure.

FIGS. 3A-5C, illustrate various configurations of a modified refrigerated display cabinet having at least one of a cabinet tank with a reduced height and a backchannel with a reduced depth compared to existing refrigerated display cabinets. With reference now to FIGS. 3A and 3B, both the heat exchanger 152 and the fan 154 for moving a flow of air through the cabinet tank 156 and across the heat exchanger 152 are positioned within the cabinet tank 156. In an embodiment, the fan 154 is a cross flow fan. Accordingly, the fan 154 may be arranged at the corner of the refrigerated display cabinet 120 such that an inlet 160 of the fan 154 is arranged in fluid communication with the cabinet tank 156 and an outlet 162 of the fan 154 is arranged in fluid communication with the backwall channel 148. As shown, a cross-flow fan may be suitable in embodiments of the refrigerated display cabinet 120 where the internal height H (measured along a vertical axis) of the cabinet tank 156 is generally almost uniform (FIG. 3A) and embodiments where the internal height of the cabinet tank 156 has a stepped configuration (see FIG. 3B).

A width of the fan inlet 160 may be less than or equal to a width of the return cavity 156. In an embodiment, a width of the fan inlet 160 is between about 25% and about 75% of the width of the cabinet tank 156. However, embodiments where the width is of the fan inlet 160 is less than 25% of the width of the cabinet tank 156, and embodiments where the width of the fan inlet 160 is greater than 75% of the cabinet tank 156 are also contemplated herein.

In the illustrated, non-limiting embodiment, the heat exchanger 152 is arranged within the cabinet tank 156, upstream from the cross-flow fan 154. The heat exchanger 154 within the cabinet tank 156 may be used in place of, or alternatively, in addition to a heat exchanger positioned within the backwall channel 148 as previously described. In an embodiment, the heat exchanger is a flat tube heat exchanger, also referred to herein as a “microchannel heat exchanger.” A flat tube heat exchanger includes an inlet manifold and an outlet manifold fluidly connected by a plurality of flat tubes. The flat tubes may be formed to include a plurality of channels, or internal passageways that are much smaller than the internal passageways of the tubes in a conventional round-tube plate-fin heat exchanger, such as the heat exchanger 52 of FIG. 2 . However, it should be understood that embodiments where the heat exchanger 152 has another configuration, such as a round tube plate fin configuration for example, are also within the scope of the disclosure.

A width of the heat exchanger 152 may be less than or equal to a width of the cabinet tank 156. In an embodiment, a width of the heat exchanger 152 is between about 50% and about 95% of the width of the cabinet tank 156. However, embodiments where the width of the heat exchanger 152 is less than 50% of the width of the cabinet tank 156, and embodiments where the width of the heat exchanger 152 is greater than 95% of the cabinet tank 156 are also contemplated herein. Further, the width of the heat exchanger 152 may be the same or may be different than the width of the fan inlet 160. Although the width of the fan inlet 160 and the heat exchanger 152 are illustrated and described with respect to FIGS. 3A and 3B, it should be understood that the widths may similarly apply to the other embodiments of the modified refrigerated display cabinet disclosed herein.

In an embodiment, such as shown in FIG. 3A, the heat exchanger 152 is arranged within the cabinet tank 156 in a forward mounting configuration. As used herein, the phrase “forward mounting configuration” refers to embodiments where the forward or first end 164 of the heat exchanger 152 relative to the flow of air A through the cabinet tank 156 is arranged closest to the refrigerated space 134. Alternatively, the heat exchanger 152 may be located within the return cavity 156 in a backward mounting configuration. As used herein, the phrase “backward mounting configuration” refers to embodiments where the back or second, downstream end 166 of the heat exchanger 152 relative to the flow of air through the cabinet tank 156 is arranged closest to the refrigerated space 134.

In both the forward mounting configuration and the backward mounting configuration, the heat exchanger 152 is arranged at an angle relative to the horizontal air flow. In an embodiment, an angle of the heat exchanger 152 in the forward mounting configuration is between about 20 degrees and about 80 degrees, such as between about 25 degrees and about 75 degrees, or between about 35 degrees and about 55 degrees. In an embodiment, the angle of the heat exchanger 152 when in the backward mounting configuration is between about 100 degrees and about 160 degrees, such as between about 105 degrees and about 155 degrees, or between about 125 degrees and about 145 degrees.

In embodiments where the heat exchanger 152 is used in combination with a cross flow fan 154, a heat exchanger 152 having a forward mounting configuration may be best suited for use in applications where the cabinet tank 156 has a uniform or almost uniform internal height and a heat exchanger 152 having a backward mounting configuration may be most suitable for use in a cabinet tank 156 having a stepped configuration. However, it should be understood that a heat exchanger 152 may be mounted in either configuration in a cabinet tank 156 having any configuration.

With reference now to FIGS. 4A and 4B, another embodiment of a modified refrigerated display cabinet having both a fan 254 and heat exchanger 252 arranged within the cabinet tank 256 is illustrated. In the illustrated, non-limiting embodiment, the fan 254 is a mixed-flow fan 254. In such embodiments where a mixed-flow fan 254 is arranged within the cabinet tank 256, the heat exchanger 252 is arranged downstream from the mixed-flow fan 254. In an embodiment, the heat exchanger 252 is mounted such that a downstream end 266 of the heat exchanger 252 is generally aligned with the back channel 248. However, embodiments where the heat exchanger 252 is arranged at a location further upstream within the cabinet tank 256 are also within the scope of the disclosure. The heat exchanger 252 may be a flat tube heat exchanger or another suitable type of heat exchanger.

As shown, the mixed-flow fan 254 may be mounted at a non-perpendicular angle relative to horizontal flow of air A through the cabinet tank 256. In an embodiment, best shown in FIG. 4A, the fan 254 is mounted in a forward mounting configuration where the first, upstream edge 268 of the fan 254 is arranged closest to the top of the cabinet tank 256. Accordingly, the second, downstream edge of the fan 254 may be positioned near the bottom 224 of the cabinet 220. In the forward mounting configuration, the angle of the fan inlet face 254 relative to a horizontal air flow may be between about −20 degrees and about 70 degrees, such as between about −15 degrees and about 0 degrees, or between about 35 degrees and about 55 degrees, or between about 40 degrees and about 50 degrees.

Alternatively, the fan 254 may be mounted in a backward mounting configuration, as shown in FIG. 4B. In the backward mounting configuration, the back or downstream edge 270 of the fan 254 is arranged closest to the top of the cabinet tank. Accordingly, the first, upstream end 268 of the fan 254 may be arranged near the bottom 224 of the cabinet 220. In an embodiment, an angle of a fan inlet face 254 in the backward mounting configuration relative to the horizontal air flow A is between about 110 degrees and about 200 degrees, such as between about 120 degrees and about 160 degrees, or between about 130 degrees and about 150 degrees.

In the illustrated, non-limiting embodiments, the heat exchanger 252 is mounted in a forward mounting configuration regardless of how the fan 254 is oriented within the cabinet tank 256. The angle of the heat exchanger 252 relative to the horizontal air flow A when in the forward mounting configuration is between about 20 degrees and about 80 degrees, such as between about 25 degrees and about 75 degrees, or between about 35 degrees and about 55 degrees. In embodiments where both the heat exchanger 252 and the mixed-flow fan 254 have a forward mounting configuration, the forward end 264 of the heat exchanger 252 may axially overlap with the downstream edge 270 of the mixed-flow fan 254. However, it should be understood that embodiments where the heat exchanger 252 has a backward mounting configuration, regardless of whether the mixed-flow fan 254 is in a forward or backward mounting configuration are also within the scope of the disclosure.

With reference now to FIGS. 5A-5C, embodiments of a modified refrigerated display cabinet 320 where at least one or both of the heat exchanger 352 and the fan 354 are arranged within the back channel 348 are illustrated. In each of the embodiments shown in FIGS. 5A-5C, the fan 354 may be a mixed-flow fan. In the non-limiting embodiment of FIG. 5A, the fan 354 is positioned such that a portion of the casing of the fan 350 is arranged within the cabinet tank 356 and another portion of the casing is arranged within the backwall channel 348. Accordingly, as the fan impeller rotates, it will travel through both the cabinet tank 356 and the backwall channel 348. As shown, the fan 354 may be generally centered about the top of the cabinet tank 356 or with the bottom most shelf 344. However, embodiments where the fan 354 is offset therefrom are also contemplated herein. Further, in an embodiment, the fan 354 may be positioned such that the fan axis is skewed relative to a horizontal air flow A. In an embodiment, the angle of the fan axis relative to the horizontal air flow A is between about −20 degrees and about 20 degrees, or between about −15 degrees and about 10 degrees.

With continued reference to FIG. 5A, the heat exchanger 352 is illustrated as being positioned downstream from the fan 354 within the backwall channel 348. As previously described, the heat exchanger 352 may be a flat tube heat exchanger or another suitable type of heat exchanger. In the illustrated, non-limiting embodiment, the heat exchanger 352 is located within backwall channel 348 such that the first upstream end 364 of the heat exchanger 352 is arranged closest to the refrigerated space and the second, downstream end 366 is positioned near the rear wall 326 of the cabinet 320. Accordingly, in such a mounting configuration the angle of the heat exchanger 352 relative to vertical air flow is in between about 20 degrees and about 80 degrees, such as between about 25 degrees and about 75 degrees, or between about 35 degrees and about 55 degrees.

With reference now to the portion of a modified refrigerated display cabinet 320 shown in FIGS. 5B and 5C, in the illustrated non-limiting embodiments, the fan 354 is wholly positioned within the backwall channel 348, such as at a location vertically offset from the cabinet tank 356. As shown, the fan 354 may be mounted with the fan axis in a generally horizontal orientation. However, embodiments where the fan axis is arranged between about −20 degrees and about 20 degrees relative to horizontal, such as between about −10 degrees and 10 degrees for example, are also within the scope of the disclosure. In the illustrated, non-limiting embodiment, the fan 354 is rotated 180 degrees relative to the fan 354 in FIG. 5A such that air is configured to flow through the fan 354 from the rear wall 326 towards the back wall panel 346.

With reference to FIG. 5B, in the non-limiting embodiment, the heat exchanger 352 is arranged downstream from the outlet of the fan 354 such that the air output from the fan 354 will bounce off of the back wall panel 346 and flow toward the heat exchanger 352. The heat exchanger 352 may be arranged within the back channel 348 such that the forward or upstream end 364 of the heat exchanger 352 is located closest to the rear wall 326 and the back or downstream end 366 thereof is positioned adjacent to the back wall panel 346, closest to the refrigerated space 334. In an embodiment, the angle of the heat exchanger 352 relative to vertical is between about 100 degrees and about 160 degrees, such as between about 105 degrees and about 155 degrees, or between about 125 degrees and 145 degrees for example. Although the heat exchanger 352 is illustrated as being positioned downstream from the mixed-flow fan 354 within the backwall channel 348 in a cabinet 320 having a cabinet tank 356 of almost uniform height, it should be understood that such a configuration is suitable for use in a cabinet 320 having a cabinet tank 356 with any configuration, including a stepped configuration.

In another embodiment, as shown in FIG. 5C, the heat exchanger 352 is arranged upstream from the fan 354 relative to the flow of air A. As shown, the heat exchanger 352 may be disposed in the corner of the cabinet tank 356 at the interface between the cabinet tank 356 and the backwall channel 348. To maximize the flow of the air provided to the heat exchanger 352, in an embodiment, the heat exchanger 352 has a forward mounting configuration. In the forward mounting configuration, the angle of the heat exchanger 352 may be between about 20 degrees and about 80 degrees, such as between about 25 degrees and about 75 degrees, or between about 35 degrees and about 55 degrees. However, it should be understood that embodiments where the heat exchanger 352 is arranged at another location upstream from the fan 354, such as at a location at least partially within the backwall channel 348 for example, is also contemplated herein. In such embodiments, the heat exchanger 352 may be mounted in any suitable configuration, including a configuration where the first upstream end 364 thereof is positioned closest to the refrigerated space 334, or a configuration where the back end 366 of the heat exchanger 352 is positioned closest to the backwall panel 346 and the refrigerated space 334.

The fan and heat exchanger arrangements as described herein are uniquely selected to minimize the in-situ aerodynamic duty losses and maximize the air management system efficiency. A modified refrigerated display cabinet as described herein may have a reduced height of the cabinet tank of less than or equal to about 180 mm, such as less than or equal to about 160 mm, or even less than or equal to about 135 mm. Further, several benefits are achieved by integrating a mixed-flow fan and/or a cross flow fan into the air flow channel upstream or downstream from one or more heat exchangers including low noise, substantial higher flow/duty point, and substantial higher efficiency fan operation. In addition, better heat exchanger coil face air velocity distribution, and thus better air to refrigerant heat transfer is achieved, resulting in better air flow distribution inside the cabinet and thus more stable product temperatures, slowing down the deterioration of food quality and lower cabinet energy consumption.

The term “about” is intended to include the degree of error associated with measurement of the particular quantity based upon the equipment available at the time of filing the application.

The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the present disclosure. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, element components, and/or groups thereof.

While the present disclosure has been described with reference to an exemplary embodiment or embodiments, it will be understood by those skilled in the art that various changes may be made and equivalents may be substituted for elements thereof without departing from the scope of the present disclosure. In addition, many modifications may be made to adapt a particular situation or material to the teachings of the present disclosure without departing from the essential scope thereof. Therefore, it is intended that the present disclosure not be limited to the particular embodiment disclosed as the best mode contemplated for carrying out this present disclosure, but that the present disclosure will include all embodiments falling within the scope of the claims. 

What is claimed is:
 1. A refrigerated display cabinet comprising: a housing surrounding a plurality of shelves; a cabinet tank arranged beneath the plurality of shelves; a backwall channel positioned behind the plurality of shelves, wherein the cabinet tank and the backwall channel cooperate to define an air passage; a micro-channel heat exchanger arranged within the air passage; and a fan disposed within the air passage, the fan being operable to move a flow of air through the heat exchanger, wherein the fan is one of a cross-flow fan and a mixed-flow fan; wherein the heat exchanger is arranged within the air passage at an angle between about 20 degrees and about 80 degrees or between about 100 degrees and about 160 degrees relative to the flow of air.
 2. The refrigerated display cabinet of claim 1, wherein the fan is arranged within the cabinet tank.
 3. The refrigerated display cabinet of claim 2, wherein the heat exchanger is arranged within the cabinet tank.
 4. The refrigerated display cabinet of claim 1, wherein the heat exchanger is arranged in a forward mounting configuration.
 5. The refrigerated display cabinet of claim 4, wherein an angle of the heat exchanger is between about 20 degrees and about 80 degrees.
 6. The refrigerated display cabinet of claim 1, wherein the heat exchanger is arranged in a backward mounting configuration.
 7. The refrigerated display cabinet of claim 6, wherein an angle of the heat exchanger is between about 100 degrees and about 160 degrees.
 8. The refrigerated display cabinet of claim 3, wherein the fan is a mixed-flow fan arranged at a non-perpendicular angle relative to the flow of air through the air passage and the heat exchanger is arranged downstream from the fan.
 9. The refrigerated display cabinet of claim 8, wherein the heat exchanger axially overlaps an edge of the fan.
 10. The refrigerated display cabinet of claim 1, wherein the heat exchanger is arranged within the backwall channel.
 11. The refrigerated display cabinet of claim 10, wherein the fan is at least partially arranged within the backwall channel.
 12. The refrigerated display cabinet of claim 11, wherein the fan is a mixed-flow fan, the fan being mounted at an angle between −20 degrees and about 20 degrees.
 13. The refrigerated display cabinet of claim 11, wherein the heat exchanger is arranged downstream from the fan, the heat exchanger being arranged at an angle relative to a flow through the air passage.
 14. The refrigerated display cabinet of claim 1, wherein the heat exchanger is arranged within the cabinet tank and the fan is arranged within the backwall channel.
 15. The refrigerated display cabinet of claim 1, wherein a width of a fan inlet is between about 25% and about 75% of the width of the cabinet tank.
 16. The refrigerated display cabinet of claim 1, wherein a width of the heat exchanger is between about 50% and about 95% of the width of the cabinet tank.
 17. A refrigerated display cabinet comprising: a housing surrounding a plurality of shelves; a cabinet tank arranged beneath the plurality of shelves; a backwall channel positioned behind the plurality of shelves, wherein the cabinet tank and the backwall channel cooperate to defined an air passage; a heat exchanger arranged within the air passage; and a fan disposed within the air passage, the fan being operable to move a flow of air through the heat exchanger; wherein at least one of the fan and the heat exchanger is positioned within the cabinet tank, and a height of the cabinet tank is less than or equal to about 180 mm.
 18. The refrigerated display cabinet of claim 17, wherein the fan is a cross-flow fan.
 19. The refrigerated display cabinet of claim 17, wherein the fan is a mixed-flow fan.
 20. The refrigerated display cabinet of claim 17, wherein the heat exchanger is arranged at a non-perpendicular angle relative to a flow through the air passage. 